Chief Minister Manik Sarkar cast his vote in the morning at a booth in Umakanta School in Ramnagar constituency.
Voting was stopped at Sonamura in West Tripura district and Dharmanagar in South Tripura district following some technical problem in the Electronic Voting Machines. New EVMs were installed and voting resumed after 10 minutes of stoppage, officials said.
Election Commission sources said about 40 per cent of the voters had exercised their franchise till noon.
Elections to the Tripura Assembly, to which the Left Front hopes to return for the record fifth time, began at 7:00 AM amidst tight security, the sources said.
An electorate of 23,52,505, including 11,64,656 women, are exercising their franchise in the election being contested by 249 candidates belonging to 16 political parties besides independents.
With the main contest between the Left Front and the Congress, CPI-M, the dominant partner in the LF is contesting 55 seats, RSP two and CPI two and Forward Bloc one.
The Congress is contesting 48 seats and its alliance partners INPT in 11 and National Conference of Tripura (NCT) in one. Of the 3,041 booths, 409 have been identified as very sensitive (A+), 535 booths as very sensitive (A) and 726 booths as sensitive.
Altogether 250 companies of central paramilitary forces have been deployed to maintain law and order.
The BSF has sealed the 856 km-long border with Bangladesh and deployed additional forces to prevent infiltration.